essentially very little
teachers went on strike when i was still at school, to get the right to a lunch break. They won. Recently more and more schools, especially secondary have reduced the breaks to 2 twenty or so minute breaks, mainly because they cannot control the pupils during a longer break. Lunchtime assistants are often ignored by pupils or can cause more problems than they solve, simply because they try and uphold the stated rules and get little support from SMT (no change there!)
As a result, as at my last school, you can find yourself assigned duties in either break, as neither are designatesd the official lunch break.
personally i wish the unions would look at things like this instead of some of the things they waste energy discussing at conference!

Recently more and more schools, especially secondary have reduced the breaks to 2 twenty or so minute breaks, mainly because they cannot control the pupils during a longer break. Lunchtime assistants are often ignored by pupils or can cause more problems than they solve, simply because they try and uphold the stated rules and get little support from SMT (no change there!)

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So - you've got a secondary school with 1200 pupils, say and there's only the LAs and a small team of senior teachers to try and control the lot of them. The rest of the teaching staff are taking their hard-won (and I know, I was NUT rep during the action in the 80s, leading my members out of school each luncthime to make the point) break.
How easy is that to do, do you think? Controlling 1200 kids with only (say) 6 teachers and LAs who many of the kids are not afraid of, no matter how hard the teaching staff have tried to tell the kids they have to do what the LAs tell them at luncthime?
Rather than make your snide 'no change there!' comments, walk a mile in the shoes of the head, deputy, assistant head or AST who's out every lunchtime trying to patrol the entire school, with its multi-acre site, why don't you?

STPCD
Daily break
63.3 A teacher who is required to be available for work for more than one
school session on any school day must be allowed one break of
reasonable length either between school sessions or between the hours
of 12 noon and 2.00pm. Deputy Head Teachers, Assistant Head
Teachers, Advanced Skills Teachers and Excellent Teachers are entitled
to a break of reasonable length as near to the middle of each school day
as is reasonably practicable.
63.2 No teacher may be required under their contract of employment as a
teacher to undertake midday supervision.

A stereotypical comment from someone who has never actually taken on the responsibilities of a member of the SMT. In my experience such people would prefer to remain as classroom teachers and whinge rather than take on such responsibilities because of their immaturity, incompetence or lack of ambition.
The same sort of people who sit in the staff room at lunchtime spouting these sort of comments while being oblivious of the fact that the HT is spending his lunchtime managing behaviour in the canteen or outside, and then criticise the HT for snatching ten minutes to eat a quick lunch during period 4 with comments along the lines of "extended lunchtime for some..."

hammie said:

As a result, as at my last school, you can find yourself assigned duties in either break, as neither are designatesd the official lunch break.

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Provided you are not assigned duties during both breaks, then your school is following the rules and allowing you a break of reasonable length.
For your information, there is no 'official lunch break' for staff. only a break of reasonable length, as per the STPCD.

hammie said:

personally i wish the unions would look at things like this instead of some of the things they waste energy discussing at conference!

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Then I suggest you take a more active part in your union's activities, perhaps by taking an office, attend conference and make sure it happens. Or is it that old immaturity, incompetence or lack of ambition which prevents you from doing so?